I have run some pretty sad tires and im not really afraid to do so. HEAT is a tires enemy. HEAT is generated by running at or above capacity, low air pressure, and driving long distances on HOT asphalt.
Does anyone remember the Ford Explorer rollover tire recall? Nearly ALL of the blown tires and rollovers happened in the SW where temps were high driving distances where long, and the manufacture had 27lbs stamped on the side of the tire instead of the normal 32-35 to increase ride comfort.
I had to change a tire for my father a couple of days ago. He was running a trailer at capacity for a distance... Because of the load there was more wight on one corner... It is also possible that that tire was not maxed out on air pressure... BOOM!
Have a spare tire, and grease and check those bearings ESPECIALLY if your going to drive some distance.